High spin/low spin phase transitions of a spin-crossover complex in the emulsion polymerization of trifluoroethylmethacrylate (TFEMA) using PVA as a protective colloid |
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Authors: | Atsushi Suzuki Motoyasu Fujiwara Masahiko Nishijima |
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Institution: | (1) Department of Materials Science, The University of Shiga Prefecture, Hikone 522-8533, Japan;(2) National Institutes of Natural Sciences, Institute for Molecular Science, Okazaki 444-8585, Japan;(3) Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan |
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Abstract: | We have studied the magnetic properties of an Fe(II) spin-crossover complex near its high spin/low spin (HS/LS) phase transition
in the emulsion polymerization of trifluoroethylmethacrylate (TFEMA) using poly(vinyl alcohol) (PVA) as a protective colloid,
in comparison with sodium lauryl sulfate (SLS). Morphological analysis was used to establish that the nanodispersed spin-crossover
complex was incorporated into the cores of polymer particles covered with PVA shells. The obvious bi-stability of the HS/LS
phase transition was considered by the identification of multiplet states such as the triplet (S = 1) and quintet (S = 2) states, and the paramagnetic state (S = 1/2), by noting a gradual shift of g-value anisotropy in the electron spin resonance (ESR) spectrum at 5 K. This was thought to have arisen from the exchange
interaction as a Jahn–Teller effect in the emulsion particles. Chemical modifications such as ligand substitution, and the
nature of the central metal atom in the emulsion particle, especially influenced the HS/LS phase transition. |
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Keywords: | Spin-crossover complex Emulsion polymerization Poly(vinyl alcohol) (PVA) High spin/low spin (HS/LS) phase transition trifluoroethylmethacrylate (TFEMA) |
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